Book blogging has completely and utterly changed what I read. I actually started a general book blog (Stuck in a book) way back in 2006/2007 and I never really got into it. I think that was because the book blogging community was so underdeveloped at the time, but I am not all that sure.
But a few years later I read The Summoning by Kelley Armstrong and thought "I need to find more of like this". I wasn't looking for YA novels, I wasn't even really looking for more Urban Fantasy or Science Fiction... but that is what I found online. And as soon as I started following YA and UF blogs, I started going out and buying them. Hell, I hadn't even known these genres existed until I started reading book blogs!
So, really, pretty much everything I read is because of blogging. It's not just that there are specific books I wouldn't have picked up without reading blogs - there are entire genres I wouldn't have picked up without blogs! Nowadays, it is extremely rare for me to go out and buy a book without hearing about it first on the blogosphere.
There are a few books I would like to highlight, though. I never would have picked these up if I hadn't read about them online - and I am so very very very glad that I did!
Glass Houses by Rachel Caine (I didn't actually like the first book in this series, but it is now one of my very favourites!)
Shiver by Maggie Stiefvater
Book blogging also got me "out on the streets" meeting other book bloggers. I usually break out in hives at the thought of meeting someone off the internet... it just sounds inherently dirty. But, for the blogging community, apparently I will do all sorts of strange and unexpected things! I have loved meeting other book bloggers - it is just such an indescribably great feeling to meet other people who love books the way you do!
I'm looking forward to reading everyone else's answers to these questions!